Hi Greg,
Please apply with --fuzz=3 (though I don't really see why this is
needed, since there's just a single line of difference in the
context).
Should work for backports to all previous versions.
Thanks,
Miklos
On Sun, Jul 11, 2021 at 3:20 PM <gregkh@xxxxxxxxxxxxxxxxxxx> wrote:
>
>
> The patch below does not apply to the 4.19-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git commit
> id to <stable@xxxxxxxxxxxxxxx>.
>
> thanks,
>
> greg k-h
>
> ------------------ original commit in Linus's tree ------------------
>
> From 49221cf86d18bb66fe95d3338cb33bd4b9880ca5 Mon Sep 17 00:00:00 2001
> From: Miklos Szeredi <mszeredi@xxxxxxxxxx>
> Date: Tue, 22 Jun 2021 09:15:35 +0200
> Subject: [PATCH] fuse: reject internal errno
>
> Don't allow userspace to report errors that could be kernel-internal.
>
> Reported-by: Anatoly Trosinenko <anatoly.trosinenko@xxxxxxxxx>
> Fixes: 334f485df85a ("[PATCH] FUSE - device functions")
> Cc: <stable@xxxxxxxxxxxxxxx> # v2.6.14
> Signed-off-by: Miklos Szeredi <mszeredi@xxxxxxxxxx>
>
> diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
> index 6e63bcba2a40..b8d58aa08206 100644
> --- a/fs/fuse/dev.c
> +++ b/fs/fuse/dev.c
> @@ -1867,7 +1867,7 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud,
> }
>
> err = -EINVAL;
> - if (oh.error <= -1000 || oh.error > 0)
> + if (oh.error <= -512 || oh.error > 0)
> goto copy_finish;
>
> spin_lock(&fpq->lock);
>
